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APPLIOATION FILED JUKE 30. 1908. 988,310. Patented Apr.4, 1911.

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I I G WITNESSES UNITED STATES PATENT OFFICE.

WIIJLIAM A. CASWELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO NATIONAL DUMP CARCOMPANY, A CORPORATION OF MAINE.

DUlVP-CAR.

Specification of Letters Patent.

Patented Apr. 4, 1911.

To all whom tt may concern:

Be it known that I, WILLIAM A. CASWELL, citizen of the United States,residino' at Chicago, in the County of Cook and tate of Illinois, haveinvented certain new and useful Improvements in Dump Cars, of which thefollowing is a specification.

The object of my invention is to provide a new and improved mechanismfor supporting and Operating dump car doors.

My invention relates to means for operating a reciprocatory doorsupporting shaft and also to means for holding such a shaft in anydesired position.

The objects of my invention will be further pointed out in the followingSpecification and claims, reference being had to the accompanyingdrawings, in which- Figure 1 is an end elevation of a car body embodyingmy invention. F ig. 2 is a cross section; and Fig. 3 is a longitudinalcross section on the line 3, 3 of the Figs. 1 and 2. In the particularembodiment of my invention which I have chosen to illustrate in theaccompanying drawings, I have shown my invention applied to a car bodyof gondola type having end walls 15 and side walls 16 with a floorcomlposed wholly or in part of dump floor sections 19. These dump floorsections 19 are hinged longitudinally at 18 in proximity to the centersills 17. Inclined tracks 20 each having an inverted T-secton extendtransversely from the center sill to the Sides of the car. Each one ofthese inclined tracks 20 has reinforcing plates 21 attached to its Sidesby means of the rivets 22. At its lower end it is Secured to its centersill by the braee 23 and rivets 24. At its upper end it is Secured tothe extreinity of the cross members by means of the attaching piece 25.The upper and outer end of the track 20 is made level, as indicated bythe reference numeral 20% Above each inclined track 20, and spacedtherefrom, is an overhanging member 26 having a transverse web 27 on itslower edge. The longitudinal shaft 28 carries the loose rollers 29 whichrest upon the inclined tracks 20 with flanges 30 engaging the same.These tracks and rollers that have just been described are underneaththe fixed floor sections 30.

The hinged floor sections 19 have channel irons tracks 31 arrangedtransversely in pairs on the under surface of the doors 19. The channels31 are supported on wooden strips 32. Opposite the channel strips 31 onthe doors are rollers 33 on the shaft 28. Between each pair of rollers33 a chain 34 has one end attached to the shaft 28, its other endextending therefrom to the point 35 of attachment to the outer edge ofthe door 19. A Channel 36 is left between the pairs of tracks 31, and inthis channel the chain 34 is adapted to lie. A few teeth 37 projectdownwardly from the tracks 31 near the outer ends thereof, and recesses38 in the peripheral faces of the rollers 33 are adapted to coact withthe teeth 37.

The end sill 39 (see Fig. 1) has inclined lower edges 40 on each side.Below these and parallel thercwith are the braces 41 which form trackson which the shaft 28 may reciprocatc in the intermediate slot 42. Alongthe upper edge of the slot 42 is a rack 43 having teeth of the charactershown in Fig. 1. n the shaft 28 is pivotally mounted a dog 44, adaptedto engage said rack 43. This dog carries a counter-weight 4.5. The lever46 has a forked end 47, the members of the fork loosely engaging theshaft 28 on either side of the ratchet wheel 48 thereon. The lever 46carries a reversible pawl 49 adapted to coact with said ratchet wheel48. Hooks 50 are attached to the end sill 39 to support the extremitiesof the levers 46.

The doors being open as indicated on the left of Fg. 2, they may beclosed by means of the lever 46, the pawl 49 being adjusted so as tocause the shaft 28 to wind on the ehain 34. Between the strokes of the.lever 46 the dog 44 coaeting with the rack 43 will prevent the shaft 28from slipping back. When the shaft 28 gets near the upper and outer endof the track 20 the depressions 38 in the rollers 33 will engage theteeth 37. lVhen it is desired to open the door, the pawl 49 beingproperly adjusted, the dog 44 should be disengaged from the rack 43, andthen by means of the lever 46 the shaft 28 may be started off from thelevel portion 20u and down the inclined track 20. This movement will bepositive because of the engagement between the depressions 38 and theteeth 37. As soon as the shaft 28 is displaced a little distance fromits extreme outer position, the weight of the doors will push it alonguntil the doors are wide open. The teeth 37 and the holes 38 in therollers 33 are in engagement only while the shaft 28 is on the upper andouter part of track 20. The purpose of this is to aiford a positivemeans for pulling the shaft 28 off from the level part 20ZL of the track20 by rotating the shaft 28 and at the same time unWinding the flatchain 34 therefrom.

I claim:

1. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, a rack lying adjacent to and above the path of movement of theshaft, a dog pivoted on the shaft and means to cause said dog to engagethe rack.

2. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, a rack lying adjacent to and above the path of movement of theshaft, and a counterweighted dog pivoted on said shaft.

8. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, a rack lying above the path of movement of the shaft, and a dogpivoted on the shaft and adapted to engage the rack.

4. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, a rack lying adjacent to the path of movement of the shaft, and acounter-Weighted dog pivoted on the shaft and adapted to engage therack.

5. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks fo-r the saidshaft, rollers fiXed on the shaft and adapted to roll across the undersurface of the doors, teeth projecting down from the under surface ofthe doors, and recesses in said rollers adapted to coact With saidteeth.

6. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, a pair of rollers fixed on said shaft and a chain having one endattached to the shaft between the rollers and the other end attached tothe door near its free edge.

7. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, a pair of shallow channels attached transversely on the undersurface of each door, rollers fixed on the said shaft and engaging thesaid channels, and a chan having one end attached to the shaft betweenthe rollers and the other end attached to the door.

8. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, supporting tracks for the saidshaft, loose rollers on the shaft engaging said tracks, fixed rollers onthe shaft, transverse tracks on the under surface of each door to coactWith said fixed rollers, and means Whereby rotation of the shaft Willcause reciprocation thereof. V

9. In a dump car, a hinged dumping floor section, a reciprocatory shaftfor supporting and Operating the same, a chain having one end secured tosaid shaft and the other end to a part of the car, means for rotatingsaid shaft, gearing upon said shaft and. upon said dumping fioorsection, said gearing being adapted to engage When said shaft is in itsouter position.

10. In a dump car, a hinged dumping floor. section, a reciprocatoryshaft for supporting and Operating the same, supporting tracks for thesaid shaft, a chain having one end attached to the shaft and the otherend attached to said dumping floor section adjacent its free edge, Vgg'earing upon said shaft and upon said fioor section adjacent its freeedge, and means for rotating said shaft.

In testimony Whereof, I, have subscribed my name.

WILLIAM A. CASVVELL. VVitnesses LILLIAN A. KIBBY, ANNA L. SAvoIE.

Gopies of this patent may be obtained for five cents each, by addressngthe Commissoner of Patents. Washington, I). 0.

